Submit draft notes in batches

What does this MR do and why?

Adds a new publish review method that will the draft notes in a review in batches of 20.

References

#444593 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. Enable the feature flag in the rails console:

   Feature.enable(:mr_review_batch_submit)

2. Create 20+ draft comments
3. Submit your review and observe in the network tab that the draft notes are submitted in batches of 20
4. Verify that all draft notes are properly published on the merge request

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.